# Glean Developer > Glean Developer - [Glean Developer](/index.md) ## oauth ### callback - [Signing in…](/oauth/callback.md) ## api Choose the right Glean API for your integration. - [Build with Glean APIs](/api.md): Choose the right Glean API for your integration. ### client-api Build user-facing applications with Glean's existing Client API capabilities. - [Client API](/api/client-api.md): Build user-facing applications with Glean's existing Client API capabilities. - [Report document activity](/api/client-api/activity/activity.md): Report user activity that occurs on indexed documents such as viewing or editing. This signal improves search quality. - [Report client activity](/api/client-api/activity/feedback.md): Report events that happen to results within a Glean client UI, such as search result views and clicks. This signal improves search quality. - [Activity API](/api/client-api/activity/overview.md):